MyBatis Plus

参考官网：https://mp.baomidou.com/

quickly start：

 Entity：

@TableName("user")
public class User implements Serializable {

    /** 用户ID */
    private Long id;

    /** 用户名 */
    private String name;

    /** 用户年龄 */
    private Integer age;

    @TableField(exist = false)
    private String state;
}

Dao层：

/**
 * User 表数据库控制层接口
 */
public interface UserMapper extends BaseMapper<User> {
    @Select("selectUserList")
    List<User> selectUserList(Pagination page,String state);
}

配备的XML：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.baomidou.springmvc.mapper.system.UserMapper">

    <!-- 通用查询结果列-->
    <sql id="Base_Column_List">
        id, name, age
    </sql>

    <select id="selectUserList" resultType="User">
        SELECT * FROM sys_user WHERE state=#{state}
    </select>
</mapper>

Service层：

/**
 *
 * User 表数据服务层接口实现类
 *
 */
@Service
public class UserService extends ServiceImpl<UserMapper, User>{
    public Page<User> selectUserPage(Page<User> page, String state) {
        page.setRecords(baseMapper.selectUserList(page,state));
        return page;
    }
}

参考：https://www.cnblogs.com/fingerboy/p/6657118.html